The LRP Vector come stock with bonded rotors (except the 3,0,4.0 and 4.5)--and because of that they seem to be a little softer on the bottom than the Novak or Orions. You can get a sintered rotor as an option however that totally changes the feel of the motor--tons of bottom and great top end. No disadvantage to the Vector compared to the Novak and Orion. I really like my Vector 6.5 and want to get a 10.5 (with optional sintered) for my B4.